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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a6d6ba135a069032760ac206392404b6776b22fc9b19dbff75c0334498ce5d' 
  AND token = '6b3kbrC1VQcXumF9OhS1YJr+pe5hTfE4gbhKuxhcwlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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