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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e113b58ac8e8b9720f037b2c74aa03eb50a1dc9ab67105b79687b2c142556c' 
  AND token = 'dM5sCaoc4P8XbKpPRqiI0rbzIY6Fq2+93iccw5lED2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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