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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59436d453cd6a16cefdd3f1074c19c36a4b6dfa74e7b5dc7ff9a55e8949b1d40' 
  AND token = 'VKKSEmH4iuy/RE9aMsRBSjfSsMAifGGwMA64u86QEfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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