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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f3b14bd373b8ae52fb268e093f52836e53953445facfc70e07ea39c0a21f60' 
  AND token = '1iRg6PJ6EAPOgX2ErUYF0q0t4hA07BEJEhQog6oChV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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