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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc06d3a3daab8da1fe8e0c0bb55455b11ebefc2e607b96146a636fb52bd1ce1' 
  AND token = 'ggDqZW18q/r1VBXxK0arF6w36eUhWrlo1VwFKrUvWjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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