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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c3e29796f5c2e49da4c3a5f106b76ca5faaa8729f79b7b1be0b3eb42d18919' 
  AND token = 'xw/u6nFVc/ZUHSnLaNYb6fmK3E9Ya006+HeJn/6l6BM=' 
  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"
    }
  }
}