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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53638b0144d4051896dc7e03347ca053960cc79c807677749d40b1a41f9ef96' 
  AND token = 'NCpomdbC9oFCt50L+uA0Bxjxj+vs+doTzhQGvgMgc4s=' 
  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"
    }
  }
}