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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c161039673882f7db12b5ef38b0d7ec8826ee93cac43a28136b1b5d9b4f7c7c3' 
  AND token = 'hOhEj+6p9YgH7IwiS19jvkR74BBuD65BVQO5rfRyIMs=' 
  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"
    }
  }
}