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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b984cf6d2017fc7bb0533e0f1f3dc7f3d2bfbce133190a27aa39935a029e175' 
  AND token = 'b/i1VUzfZm5yvHO731SmETSY2uVcef/07xv0oLDO8Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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