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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf0b0c5f6744317eb5e0210e34cd7af0a2ea44539799a5599e77417c45e01e9' 
  AND token = 'djO9jTWUJqVpyFDKDZ6B3HkV3GGfH481KrOSFzbMFkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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