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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff842683352f40c8a9c7f2a3d5a615e3cb6b4db28572b7f87f7bac1bd2d3058' 
  AND token = 'ZfN+eG3FFnDrv8W/tmDI7zfgknzDa4ffgNOmQ8ltZR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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