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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11f54dd20d7079f93c822b984ca71d022a03d1612c1aebdc4bed06770b1f7f2' 
  AND token = 'FEMe0+zjo61NjygQhD5fndFfffQtEt0Yp83KavsrAoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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