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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4626151ca3c9cdecfea99e22719f80dfd450765ce7b93c6eb85056cfa7c71dc2' 
  AND token = 'c3LG7cv7/qMZ4TowPmjxaJqKti6HfO0nZ1x2C76ZfNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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