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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afb36ad97ba30302e79448ceb5ab7d5dc05a0a37012c70df868cabafb6f617c' 
  AND token = '3orrPKp+OIsqUMVgLLtlIrQ2Nm5PGnsv1H1zrEAAzbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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