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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e68b278c39b42323f531b1de1d87cb293c5e4b9813cc2968dcc3b56776cf881' 
  AND token = 'S8ssW4ruvcWej48e9EYs4Hnozlz5DQ2SbKmN8ZrYEsM=' 
  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"
    }
  }
}