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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a725b6d363a745e379e87dcc4edd5e2de9c1e972e8925625c5e17e9c54c8ed84' 
  AND token = 'BdFAnKVZ3l0j2c+nqVjNLIHDe/GkdyPlCoifIWa4DXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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