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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17126e04e673b42686419e93a533fb15132a999a77d0f873268152130b44892' 
  AND token = '96HyAy1PxprNcE6lhr5sLW9ukKwFcLRk+ggzwW3h7/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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