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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd389897f48a402c15764e3626e8376bac9e7d36e8c6dc00a73a05865c18d99' 
  AND token = 'Cg7/KqhHpbWn37N7x/EZQylL0p28Qe3mJx/TrbwReMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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