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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95c5a599f18e2caae5c43cafe7f435107c48cb3e6d5a178f38686302b691cc9' 
  AND token = '0bH90x/cJD9/1QPZNJWtq2C84BhW3fe0jfgIzl6qD+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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