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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b51dc39356c38ffd8643843c893f7b204ad147d5bedb6ace280cbc7ec3114e4' 
  AND token = '27E2O69Br85lnOWMbXe8TTH+gPiQ1Me4hzacGjvYNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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