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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af692f6e7f305606bdedf7eb57d5aae2758ae9aeeb70cf331bb517eedb5de5f' 
  AND token = 'iRTR3TrdgsCfmB4VfRsGKzN+CcyvH25vzZS3TpOqMv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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