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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee65822b2d44f15660bcad97e8b246781bfd5f4bb7be428b5a94d16d7d98489' 
  AND token = 'TFgHYhvsoUli2RQHYAMrg7ORJFfJIOjcAIZEpvqoqZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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