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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92967cbd3f0b39a50658d964d20cd38763b62082cba819456880769055727873' 
  AND token = 'l5kjcNBtMTXmtawdnpj/uG22aRO9CHVv2MOxtu0GeJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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