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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75f7ad92878e3ce1f50cb4ec17bf7193937f5e1774d67519117856f54a158f3' 
  AND token = 'FgETuM7Hu/RrFiiHCjwkYVOwedYD6VXN8v/wmc/HxRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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