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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4312c28be48a49458b5537abbf85309f0e2af8274ec22f71761c9a5ece057d54' 
  AND token = 'sN6jSDtOm97DQtn6jvrozcIX9M4y3wAZYksSmXUCgMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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