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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f5f2c7581ff30e4c3e7e6dfd9f1a9ab5b4c6aac0607b457131d0fdb7156ea1' 
  AND token = 'bg9KoY7ssWNmNZ+wSwu7UWduwtbWfBDdKLx7EzwErSc=' 
  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"
    }
  }
}