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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e55f86a5464821db4f62e903f453cf89b147f229dfa58cb0c92acbf51eec2ae' 
  AND token = 'AfvvDzIomKz6VY0gp2KYZhGZmarswsVJQm40c4Q4dY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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