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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8097cf1d067f513c5b83e906bedd2bd20d16f0b0eee858c8b96bb93fab2dd35f' 
  AND token = 'FKhcxVeXLD18Rq6eXByPSi5G7vdkkGF2oZUnNZ64LIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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