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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59199c0aa70e582dca0e3a0332337beb6204d8bab7f694a0f846c91208f71460' 
  AND token = '/AMbYBW4hEV8y4s2/fQY4bbBu8Fkjs84HR5gWzT2W1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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