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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64c0b89689e442fa1616480b89c5c47fd3eb4e838383b4610e7680473c70970' 
  AND token = '3WFjboTOsT6D3ox/tk5Ma9jyrWIPW1Vwvz/zuyCNZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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