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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e1c60a1215f9aff2c24dd2d021fb2ec013c29bf468e4abc59ab0437507116e' 
  AND token = 'Lht3atBfW6y3J9TONk3p2G9RuV1VNZYLmn0K4e/Iot0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}