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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a5471520c4541aac6e48be06ff3c1f632ddc34d186cc07a147aa862ffae69e' 
  AND token = 'DECVPq0Is+8n4ueACNIdYOz1x5og8eH3RuBX1rMph+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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