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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2569f552f54445ce401540b4672d6f2745c1890b5eabeaa9813b0cad6fdd76' 
  AND token = 'HCLJCGJtihkid1vmINKh90XanJ2Ais1RYjyrML5q8ds=' 
  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"
    }
  }
}