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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8eb53d8c4f56b5c2ddd009a3d3e588d558f4b9a2eeed29eb524498700c7822' 
  AND token = 'k5r4D3WJJK5PVOpMu117iW+txTmnEqzEZTmzTBG3Xts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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