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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8298dcd65744d26b4dc57f118711a1ee913ac2b4fd63fc7483fe4b086175e6ae' 
  AND token = 'SwXabxiNG9LUv1DePkEziIt6jpRlXeAJV5x+RRppuJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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