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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce678ed3a2d1c942dc371d1b237889108fbecb5c8d7d3a8d2400bccdb3052632' 
  AND token = 'VubKJ8RXHY7PTr0niOijd5bkFWWiyX2lv/oDZFbr69w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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