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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86b62e63b49ba206932792bb2c62052226b77c423da42f41fffffb9b654c75e' 
  AND token = 'oUvr/DPTzhfC5bXXWWrUlaB86neFxKpsJqMRwHyu41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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