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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606e6c136bc543c0cfff3ff89e764089efc1bacfb83decf1979b0beac9ee4521' 
  AND token = 'k14NiCBhfXhtJmpb+iIJtLcICjPrOV7RinOpa3ZbqGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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