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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb9de8d7ec0d32ceba2ac7d447090c180b63bf5d7ace103d0f5af55b00bfd3e' 
  AND token = 'gnakYQNdg/wymraFozBMvGOU7qe7wKK6PI2SmimQH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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