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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229e92506f09b304c84fadf6bc0ca97300a85de667a5de96ca4acf74ab7eb811' 
  AND token = 'K+Sk2qdU2Yav0/9Iotpu9Qcg3qk29JXtTixXXwOH3WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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