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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bf08cf6b9ea2a6b9cc3a3dd7fc2b4626a2cc8ef7dbf4121941b9f342b2070d' 
  AND token = 'fFrJEkFuQCi6RzTIS4Cf12HvPwqHyzSo6KCqzrGJgcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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