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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2633e780b4eb9f257fbb2b795c07356f8a252cba473678878e3f31c8a984e73f' 
  AND token = 'W372RCTv4Cd5ibzb4u5OOnDodQ4E3NuX94hmq/cwbpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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