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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2372697b7d819b1b357a9280aa55fbb5bde4f1b59deab31085f160a48d3d99ba' 
  AND token = 'Q4h58/a3tsJsaBXHSd8h83hmO6+awa4SRCnvWXmILgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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