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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfb2d4599896874dfb342674a9eab76e91fb9eb36ff1d5529ea88e3a1002809' 
  AND token = '10k1HEBqnf3GnrhNY3/euSmef64GyHpSVeVhle/rYVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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