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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b395e9ea71db180501b233d4b5d00d442be01d3223f8448fb3ad92e6b40b3e9e' 
  AND token = 'F7O8mIn0goJsRuCkGEMtqOOUQHTOJI5TyE+Di00IOBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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