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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fce5a4289d4736929fe495c1cc33f90d85b6ed7be2a354a3bef89571f39d9b' 
  AND token = 'T2f6CR8S3QIBjdHw+5GuT4gStyW30kUFq7d/yV1ORco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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