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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df77ad510a5b6cff26218d64daefa5ec67b47489d6f2b8ecfddb1d8c8301f3f6' 
  AND token = 't4qaY7A4gLFI8oMKNUTywAgbmfkGISpfqfC9926EMEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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