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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122be1e56570c0338f115867d5950df6947a9684db79af390ef7852b8fb142fb' 
  AND token = 'ImaWVOkbDlv9YTkdqb61S56tPBB0B4ZJN3/NIcPJ/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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