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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c9d98d41083fd0e2ba584bc6d581528678131d51e816fba5fc727eeb43393e' 
  AND token = '4gNSrs3i69lr/4TDpuJQ1NN/BI/0gZSaOK/QRmXuYNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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