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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044d73b4f51069369e290b05e0945dac6520910de6b6bff3dc7b5a7de2b944d' 
  AND token = 'X+V2Mqk4hcDsq1+YQdRY5SHu69wlSTMQZJb/q6QCbDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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