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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f84ec3002233d30850ec725167df1c0cf7eea33f50a5968c5971d648ecacd24' 
  AND token = 'w4+KK7ijmQrjABcLkJ29Z61cMV+zGG5eOJAB60/D0RU=' 
  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"
    }
  }
}