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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b576ae0b046f26e66a4264b7bd00f87f3d4ed6043acc5ab53f78b515696ad540' 
  AND token = 'XNuDcgtq5PKhnsUzbB87XCFKw1J6pZ/oEVOm3bh6o3Q=' 
  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"
    }
  }
}