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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ea4b519915c3be96a7f5a1159f764195e7bf93eb97b830a5d8c40cc4b33c85' 
  AND token = 'qglRtXmQsdtKwB8QKROMv1lTqtpwnBLuKiR2d6glGQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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