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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4356c49c05b2255db3327386f1371e64066bb3e08245c00e9b529f34cac35c' 
  AND token = '4HwvoyOotb46mV2sIzlU7BJXFIdVT+zQ1q+pfoEdUQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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