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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78539ef8968301f377ea29514949d2c6400e6b2ee7204d922cfa4d2f90680916' 
  AND token = 'yKLcDsjA9P9bC9ovYczVt7tGwjMQ7pPovcs+vwAKiyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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