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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc7212631c3a5aa485b78cc598de285b8386cb0606e98705cfe6c53936e7f9a' 
  AND token = 'HB+H0uQXhcpOrtO0Fww4VG9yv3RuDTP1NuQ8L50g9iU=' 
  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"
    }
  }
}