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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ff1b5f87509afacae4f3e321cd7d9fcd6f3f6a38a45c096f29e7304acf1dd2' 
  AND token = 'wejn/PjxgieR3UpWHsYqWgU7vcMvfaRegsMH5Q29DAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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