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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f2256f2afec8d660a8c41dce1573e76df0cc214f5efce5a50aafa94de05c7c' 
  AND token = 'Ysce9/wiATf55p5xds+20ue6qFDGdBxuNNnyenb6P1c=' 
  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"
    }
  }
}