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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a3ed475e0f0424b7f37feee29889567d381fa3aa80c65ad1885bb464d44437' 
  AND token = '0cdDhG4A8MIcgsxqM7XNYLQMl3lJPLRKJbyPl6LN9aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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