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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd89536b817dede3fe8ae14525fa7f7a2c3505a43afad92b9cb70111f99a678' 
  AND token = 's0AAxyH+Nalq6X2DrD2Pz6jHjNggV1tmSn23lUhHJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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