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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e42e4d05c24587c98c91ba172622ed6fe9a3ef656c295d8ae627946d0b7f6ea' 
  AND token = 'DIZCebE+KPT6C95y9Szs8mYl+gHHYOe85ZgMp4ilBNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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