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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02c0fa57d63b3b6fbd8d16362e0368a23dab4b666dd43bfd231b5d739ffdb80' 
  AND token = '+/TO9ZC3tSE2yLv+SybkODKfp60r0PWRmqyjzR0bIlc=' 
  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"
    }
  }
}