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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dbe2974f65ba5085f27c4134f1331553f05fbfea4436cf53772ce3d2a25075' 
  AND token = 'OBAOuoC6WZVbsimtsfTh6YjVqAfBdhfR/zFiTdRxULo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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