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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c072d229ffd4ea72ffcc3ce40cce6495e5d0e08da3ede86235b94af27e69181' 
  AND token = 't/N4lkQ/QjWv62pbjQyEIpuKlywlC73kLpsHePblBpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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