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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fb114adaf2660691025d11046214c7cb6723d6ac574a972380b8e011bba6c6' 
  AND token = '6Fh6btEIcwF4xw0qQxKi3UW6vOeQ1RvYLIhr2qLKInI=' 
  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"
    }
  }
}